有理数加减法运算-0.5-(-3 1/4)+2.75-(+7 1/2)怎么解急_数学解答

有理数加减法运算-0.5-(-3 1/4)+2.75-(+7 1/2)怎么解急

人气：289 ℃　时间：2020-01-28 15:41:55

解答

-0.5-(-3 1/4)+2.75-(+7 1/2)
=-0.5+3 1/4+2.75-7 1/2
=-0.5+2.75+3 1/4-7 2/4
=2.25-4 1/4
=-2